191620

Appears in sequences

• Central factorial numbers: A008955(n,3).at n=4A000597
• Triangle of central factorial numbers |t(2n,2n-2k)| read by rows.at n=31A008955
• Number of symmetric nonnegative integer 7 X 7 matrices with sum of elements equal to 4*n, under action of dihedral group D_4.at n=14A054497
• Number of -n..n arrays of 4 elements with zero sum and no two neighbors summing to zero.at n=32A199833
• Triangle read by rows, Stirling cycle numbers of order 2, T(n, n) = 1, T(n, k) = 0 if k < 0 or k > n, otherwise T(n, k) = T(n-1, k-1) + (n-1)^2*T(n-1, k), for 0 <= k <= n.at n=41A269944
• Bemirp gaps: differences between consecutive bemirps.at n=33A333648